FANTASTIC FOUR #21 (1963)

Okay, this is a weird issue. The villain, Hate Monger, dies at the end and we see him unmasked as Hitler. After which Reed immediately says that it might not be the real Hitler, it might just be a look-a-like. On the whole, it’s heavy handed and kinda dumb.

But the significance factor gets raised when Nick Fury shows up…

…This is the first time Stan Lee tried to tie his “period comics” (i.e., World War II comics) into the main Marvel Universe.

Creators: Lee/Kirby

First appearances: Hate Monger, Nick Fury in a comic that takes place after WWII